feat(icon): Notion-style icon picker + custom workspace emojis; fix side peek file content & ctx menu overflow

app/migrations.py

@@ -335,6 +335,25 @@ def _migration_v54_page_versions_cover(conn: sqlite3.Connection) -> None:
         conn.execute("ALTER TABLE pages ADD COLUMN page_icon TEXT DEFAULT ''")
 
 
+@register(8, "v5.6.0: custom workspace emojis")
+def _migration_custom_emojis(conn: sqlite3.Connection) -> None:
+    """Workspace-wide custom emojis (uploaded images) used as page icons."""
+    conn.execute(
+        """
+        CREATE TABLE IF NOT EXISTS custom_emojis (
+            id INTEGER PRIMARY KEY AUTOINCREMENT,
+            workspace_id INTEGER NOT NULL DEFAULT 1,
+            name TEXT NOT NULL DEFAULT '',
+            url TEXT NOT NULL DEFAULT '',
+            created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+        )
+        """
+    )
+    conn.execute(
+        "CREATE INDEX IF NOT EXISTS idx_custom_emojis_ws ON custom_emojis(workspace_id, created_at)"
+    )
+
+
 @register(4, "database templates (icon) + property validation")
 def _migration_db_templates_validation(conn: sqlite3.Connection) -> None:
     """v5.3.0: database templates get an icon, properties a validation config,